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Questions tagged [experimental-technique]

filling in the unspecified details of elegant-sounding descriptions of experimental methods.

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Continued calibration of atomic clocks

First off I am not well versed in physics, but as I understand things the second is defined by the ceasium fountain clock which is calibrated as follows How was the first atomic clock calibrated?. Now ...
Emma Harris's user avatar
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64 views

Are there any recorded time-of-flight (ToF) measurement data for the $H\to\gamma\gamma$ collision products at the LHC Atlas detector?

Especially, I am interested in the time-of-flight (ToF) measured recorded values of the two $\gamma$-photons (diphotons) during $H \to\gamma\gamma$ Higgs boson detection events at the LHC Atlas ...
Markoul11's user avatar
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Plausible explanation for anomalous plasma antenna time difference of arrival?

Consider the below-pictured time difference of arrival system consisting of two plasma antennas* with opposing DC bias. Samples of time difference of a 100MHz signal are taken as the TDOA system is ...
James Bowery's user avatar
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"Blow away detection" to measure atom survival in a tweezer array

I am trying to understand the implementation in the following paper (PHYS. REV. X 12, 021027 (2022)) to present it as a term paper for my undergraduate course. I have a basic undergraduate background ...
Krishna Balaji's user avatar
1 vote
0 answers
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What is the fastest (fast time response) peltier module commercially available and where can I buy it? [closed]

I am searching for a peltier module which has a time response of at least 0,1 seconds. I looked around in the market but this is not usually a characteristic shared by the manufacturer in the data ...
0 votes
1 answer
39 views

Why do we only consider two points in Young’s double slit experiment?

Say we have two slits in the xy-plane. The x distance between them is d. Why do we, when calculating the resulting amplitude of the wave, consider only the phase difference of two secondary radial ...
Максим Неважно's user avatar
0 votes
1 answer
66 views

How is the interference pattern of the double slit experiment quantitatively measured? [closed]

The single photon / single electron double slit experiment shows particles appearing as dots on the screen. This is explained as being due to the collapse of their wavefunctions. However, if they were ...
Blacklight MG's user avatar
2 votes
0 answers
45 views

Is it possible to make a dual-mode, multi-band laser?

Understanding how N2 and CO2 gas lasers work, Is it possible to make a gas laser (i.e. with the right gas mix and excitation source) that: has more than one mode of operation, emits light in more ...
Hunting.Targ's user avatar
1 vote
0 answers
52 views

Need help with experimental setup to measure Birefringence [closed]

First message here, sorry if this is scrappy: I am looking to measure the birefringence of multiple crystalline structures (calcite, ice, etc), and came across this methodology: Shine a laser at ...
Pyreau's user avatar
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Experiments on downward causation due to higher order configurations

Are there any experiments done to verify the absence of forces caused by complex structural organisations in systems? Afaik, experiments in QM and Standard model QFT talk about the validity of the ...
Razor's user avatar
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0 answers
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Project Scorpius. Can similar goals be pursued with diamond anvil cells?

I just read an article describing the project Scorpius. The aim is to use explosives to compress and heat microscopic quantities of Plutonium in order to study the states of the matter in extreme ...
FluidCode's user avatar
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1 answer
160 views

In four probe experiment why the graph looks like in low temperature

I found a graph between the log of resistivity vs inverse of temperature like this So in region 2, why is the graph going down?
Joy's user avatar
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1 vote
0 answers
15 views

How does MEMS low insertion loss fiber optic switch work? [closed]

I'm currently looking for a low insertion loss fiber optic switch to be able to change the light source of a spectrometer. Since this will be used in harsh conditions, I was hoping to find one with no ...
coffee's user avatar
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0 votes
1 answer
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Why were multiple layers of absorbers and scintillators used in the CMS HCAL?

Why were multiple layers of absorbers and scintillators used in the CMS HCAL? Couldn't they have used just one absorber and one scintillator layer? Why was the choice made to have multiple layers?
secondquark's user avatar
0 votes
1 answer
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Are there references of influences on physical processes in experiments?

Suppose I have some physical process to use in some experiment. For instance, let's consider just looking at an object to measure its position. The basic modelization for this is to consider geometric ...
Slereah's user avatar
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8 votes
2 answers
174 views

Condensation on the side of a cloud chamber

I'm trying to build a cloud chamber using a peltier thermoelectric cooler. So far, I've managed to detect some particles, but their trails are very weak (I've used a high voltage generator, about 4kV, ...
Luke__'s user avatar
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2 votes
0 answers
73 views

Measuring the acceleration due to gravity using an experiment [closed]

A student measures the acceleration due to gravity, g, using the apparatus shown in the figure below. A plastic card of known length is released from rest at a height of $0.50$ metres above a light ...
w3l271's user avatar
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1 vote
2 answers
295 views

Prevent Foucault's Pendulum from an Ellipticity

I am using a 15kg dumbbell as the bob of a Foucault's pendulum attached to a string of 4 meters. However, using the common method of burning a wire to set the bob in motion, it will begin to oscillate ...
Dian Sheng's user avatar
1 vote
1 answer
45 views

How do we know the location of entangled particles after leaving the source so that we can set up our measurement devices?

Studying the Bell Inequality and was wondering how exactly experiments like Bell's are conducted. I understand the premise of the experiment to be that an entangled pair of photons or other quantum ...
Jack Casali's user avatar
2 votes
2 answers
83 views

Cryogenic and vacuum safe cable labeling or tagging

Not the most in depth of physics questions, yet this feels like the right community for trying to crowd-source this type of expertise. Essentially it is a question for those of you experienced with ...
user129412's user avatar
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1 vote
1 answer
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Experimentally Tracking Fluid Flow

I've been facing this issue and I will be very grateful if anyone could offer insights! I have a stream of water that starts out from a nozzle flowing down vertically. The stream of water hits a ...
Christopher Cooper's user avatar
0 votes
1 answer
74 views

How can an experimental physicist create a free electron gas in air? [closed]

Suppose an experimental physicist has to create a free electron gas in a test chamber filled with air or any gas. They can do this with arcing, photoelectric effect, or others. What would be the best ...
Tachyon's user avatar
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3 votes
1 answer
23 views

Experiment preparation - Box to reduce background photons noise

I am planning to perform experiment with a photomultiplier tube (PMT) in my lab. The system is not large, with a length scale of about 10 cm. I am looking to reduce the background photons noise as ...
Sagigever's user avatar
  • 555
1 vote
1 answer
127 views

How to measure spectral irradiance vs wavelength for sunlight?

I am currently working on a project where I need to measure the spectral irradiance over a submerged solar panel at different depths of water. But I do not really know what can be used to measure it. ...
Kalpajit Roy's user avatar
3 votes
5 answers
668 views

Experimentally Measuring the Velocity of Water coming out of an Orifice

I plan on doing an investigation into Torricelli's Law, where I will be looking at one of the following: How the cross-sectional area of an orifice affects the velocity of water coming out of it (...
aayush's user avatar
  • 217
1 vote
1 answer
87 views

What is an event-ready scheme (at-a-glance) in the context of Bell-type tests?

The abstract of Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres says We use an event-ready scheme that enables the generation of robust entanglement between ...
Galen's user avatar
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1 vote
0 answers
27 views

Holding Electric Potential Constant Between Two Plates

Let's say I had the following laboratory set-up: Two conductive plates with an electrical potential $\phi$ between them, and a fluctuating potential $\phi$ (created by some arrangement of fluctuating ...
Eriek's user avatar
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2 votes
2 answers
508 views

Experimental measurement of the coefficient of static friction

In the experiment section of a regional physics competition, we were asked to experimentally determine the $\mu_s$ of an acrylic block against three kinds of surfaces. One of the sub-questions asked ...
Jonathan Huang's user avatar
0 votes
1 answer
29 views

Automation and remote controlling

I am very new in the field of experimental physics. I want to pursue research in the condensed matter physics. I have observed that most of the instruments such as lock-in amplifier, digital current ...
-4 votes
1 answer
280 views

Are all Astronomers also technically physicists? [closed]

There is a website many schools will use to show their students job descriptions to give them inspiration and know what they wish to be when they grow up, show them some options, you know? Well, I was ...
Jkt's user avatar
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0 votes
2 answers
485 views

What are internal and external estimates of error?

I have n measurements for a quantity, and I need to calculate the internal and external estimates of error. I know what standard error is and how it is calculated, but have no clue regarding internal ...
Sai Teja's user avatar
2 votes
0 answers
55 views

Measure small mass change on heavy item [closed]

I need to measure the change in mass on a large number of components we are developing with a size of a large orange and weighing between 0.3 and 1 kg to an accuracy of sub 10x10-6 kg. The mass will ...
JPJP's user avatar
  • 21
1 vote
0 answers
58 views

Papers of real experiments measuring momentum of individual particles?

I am trying to understand the different methods that have been used to measure the momentum of individual particles. I have been able to find a few methods (with corresponding papers describing the ...
don't train ai on me's user avatar
3 votes
2 answers
316 views

Falling yoyo experiment

I was playing with a yoyo and a spring dynamometer and realized the tension during the fall is not constant but clearly has a small oscillatory component. This experimental result contradicts the ...
Shaktyai's user avatar
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1 vote
1 answer
107 views

Experimental design and precision for calculating moment of inertia

Here is the experiment: A hanging mass is placed on one end of a three-step pulley. The pulley rotates a rod with masses, $m_1$ and $m_2$, on each end. Now, we know the moment of inertia of the two ...
user1070280's user avatar
0 votes
0 answers
24 views

Rate Upper Limit Inference With New Background

I am trying to set an upper limit on a process in an experiment. Over a given time period I observe $N_1$ events, which are all likely to be from a background. The background events are a Poisson ...
user3517167's user avatar
1 vote
1 answer
119 views

How can a neutral atom, e.g., a rubidium atom, be accelerated to a high speed? [closed]

I have this question because I am studying quantum friction for my PhD project. Quantum friction could refer to the frictional force induced by the electromagnetic field fluctuations on a neutral ...
MichaelXin's user avatar
16 votes
2 answers
2k views

How is time measured in particle experiments?

I was reading about the half life measurements and was curious to understand the experimental setups that allows so minute measurements to be captured. Specifically looking into half life of Higgs ...
Sohail Khan's user avatar
-1 votes
3 answers
89 views

Experiments check out theories but who or what checks out the experiments? [closed]

There is a classic saying which goes more or less like this: If your theory is not verified by the experiment then it is wrong! Specifically for the field of particle physics, lately experiments ...
Markoul11's user avatar
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1 vote
1 answer
251 views

Measuring radius vs diameter for a circular ring?

Consider an experiment where I have to measure the radius of a circular ring diffraction (or interference) pattern (think Newton's rings). It is advised to measure the diameter and then divide it by ...
Lost's user avatar
  • 1,441
0 votes
1 answer
631 views

Single slit diffraction with a slit width much larger than the wavelength

It is known that for a diffraction pattern to be strong, the wavelength of incoming laser light should be comparable to the slit size. The reason being if the slit is very narrow it effectly is a ...
Lost's user avatar
  • 1,441
0 votes
2 answers
120 views

How can we conduct experiments to verify formulas without special equipment? How was it done in the past?

If we wanted to verify experimentally/empirically as laymen without special instruments a formula such as $s=16t^2$ which is used to approximate the distance s, in feet, that an object falls freely ...
Jim's user avatar
  • 111
1 vote
0 answers
39 views

Understanding the 'Truncated DFT' for Moiré Phase Analysis

I am researching the use of a Moiré sampling algorithm in order to determine the two-dimensional displacement field of an object. In the paper of Wang and Ri (2022), the algorithm is described. ...
Vincent Boon's user avatar
0 votes
1 answer
74 views

What is a proper resolution, and how many times of measurement needed for a credible experiments? [closed]

This question aims to understand a basic intuitive understanding and proper doing in practical situations for designing experiments. Resolution Suppose there is an object large as a hand. What is ...
Kanokpon Arm's user avatar
2 votes
1 answer
131 views

Charge separation by friction: Experimental problem

In introductory electrostatics one often sees an experiment where the instructor rubs a rod (for example a PVC or a glass rod) with a cloth (for example made of wool, cotton or silk). And then strips ...
dp21's user avatar
  • 161
1 vote
0 answers
30 views

Can laser diode characteristics comparison be based on laser of one length?

As we know, e.g. from this website, to know the laser Transparency Threshold Current and Internal Quantum Efficiency, we need the LI curves from lasers of various widths. However sometimes it is ...
user46147's user avatar
  • 3,034
2 votes
1 answer
226 views

What are the sealing adhesives for high vacuum system?

Recently, I have a project that needs to use a high vacuum system. During the construction process, I encountered a problem: I need to stick mica or glass to the window of the copper wall (one side is ...
gailulun's user avatar
-2 votes
1 answer
82 views

One-way speed of light confirmation, not measurement [duplicate]

So there's quite a few posts on here about the now infamous YT video about how the speed of light can only be measured as a round trip. I think I understand the issues with the proposed experiments I'...
Elias Van Ootegem's user avatar
0 votes
1 answer
54 views

What are some physical or mathematical conecepts/techniques that can be used to "easily" do numerical experiments/analyses in physics? [closed]

Basically I'm asking for concepts/techniques (don't know if it's the right word) that can be used/applied "easily" to eg. a physical system. It might be used to identify a behavior or a ...
Tim Hulland's user avatar
1 vote
2 answers
139 views

How can we detect neutrons?

If I am asked to design a simple experiment to detect neutrons, how can I do that? The problem is, neutron is a neutral particle. So, application of electric and magnetic fields won't help. Can I ...
Neutralino's user avatar

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